Comscore Releases November 2008 U.S. Search Engine Rankings

RESTON, VA, December 19, 2008 – Comscore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released its monthly Comscore qSearch analysis of the U.S. search marketplace. In November 2008, Americans conducted 12.3 billion core searches, a 3-percent decline versus October, which can primarily be attributed to November having one fewer days in the month.

November 2008 U.S. Core Search Rankings

Google Sites led the U.S. core search market in November with 63.5 percent of the searches conducted, up 0.4 percentage points from October, followed by Yahoo! Sites (20.4 percent), Microsoft Sites (8.3 percent), Ask Network (4.0 percent), and AOL LLC (3.8 percent).

* Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.

* Based on the five major search engines including partner searches and cross-channel searches. Searches for mapping, local directory, and user-generated video sites that are not on the core domain of the five search engines are not included in the core search numbers.

November U.S. Expanded Search Rankings

In the Comscore November 2008 analysis of the top properties where search activity is observed, Google Sites led with 10.8 billion searches, flat versus October. Yahoo! Sites ranked second with 2.6 billion searches, followed by Microsoft Sites with 1.1 billion and AOL LLC with 725 million.

About ComscoreComscore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital marketing intelligence. For more information, please visit www.comscore.com/companyinfo